Press.



-ransrbnr w WENT COIWNNY, 0T' HARTFORD, CONNECTICUT, A CCRPCMTICN 0F CONNECTICUT.

rance. a

To all 'whom 'it may concern.'

4 Be it known that l, PnEs'roN lUrHAM, a citizen .of thev United States, residing in' Boston, Sudolk county, State of Massachusetts, -have invented an Improvement in Presses, of which the following description, in connection with the accompanying drawings, .is a specification, like characters on the y vdrawings representing likel parts.

vMy invention, one embodiment of which is illustrated in the accompanying drawings and herein described,` relates to certainv improvements in block-forming presses which improvements possess many features of noveltyv and invention which are useful either in combination with each other as dis-- closed, or as'used'separately in any type of press. Une of these features is my pressure `creating and pressure transmission system. Tt ,dn

other is my improved construction for operating and timing my mold opening, lling, and closing means. Many Vother features of novelty will be explained hereinafter. p v

The drawing shows' a diagrammatic view .of thepress. A

lin the embodiment of my invention disl closed in this drawing the driving pulley 1, driven by a belt from any suitable source of power, such as a motor, is-shown keyed on the shaft 2, to which is keyed the pinion 3. The pinion 3 meshes with the gearl keyed on thev timing shaft 5 so that said belt and gearing constitute' one type of motor for said shaft 5. The timing shaft 5 is rovided vwith a crank 6. vA connecting ro 7 ,con-

nects said crank, through the medium of one form of pressure determining or l limiting means to be hereinafter described, with a displacing lunger 8 which reciprocates vin a part of a en der 10. lin lieu of the crank 6, l may, with'- out departing from the spirit of my invenpre The hydraulic cylin er 10 is provided with pressure responsive means herein shown as a amber 9 of the hydraulic cylin tion use anyv other suitable pressure actuator ferably one having a hned throw, as for example? an eccentric or cam, altering the' a' connection with the lunger 8 to correspond.'l

npecincation of Letters Patent. Pmbmmtgd Nimm@ 259 p @jllo amputation and august as, ien. sermaccaacic.

ing shaft 5 will produce reciprocation of the ram 11 and that the 'pressure applied to the displacing plunger 8 will be multiplied when transmitted to the ram 11 in the same ratioas the respective areas of the displacing plunger and ram.4

The pressure system, one form of which is herein disclosed, is desi ed primarily to cooperate with a mold annmechanism to open themold for the ejection of material and mechanism to close the mold for compression. While it is immaterial how this open-y or nosron', urnssncmusnrrs,4 assreuon. 'ro rn'rnmvn'rron'ar. ravising and closing is edected whether bymovev ment of the mold, or the mold cover or both,

ll prefer that the before described pressure system should' coperate an auomatically o erating mold,` for thef compression of b ocks, bricks, tiles and the like made from asphaltic or other plasticmaterial. ll/have shown in the drawings a' mold con ai/ning member 17 having a mold18, and a plunger 19 operable by the ram 11. To fill this mold 18, to coversit when the material therein is being pressed and to. uncover vit when said mold is being emptied, it is necessary to provide operatin means to move the mold .relative to the mo d cover.

mold adapted to be moved relative to the filling neck 21 and the mold cover or presand also herein to provide a well or period of high compression, lhave provided between the crank .6 and the' displacing plunger 8, pressure determining or limiting ln the embodiment vherein described, l have shown a sliding means herein shown as the steam cylinder 13 containin a piston 14 and'provided with a piston ro 15 ,connected to the displacmg plunger 8. Elasticduid is introduced to one end of this cylinder in such a maner as to force the displacing plunger 8 away from the ressure actuator 6. This constitutes one orm of compensative means which compensates for any variance in stroke between the ned throw of the pressure actuator and the variable stroke of the mechanism actuated by thenned throw actuator.

The .operating means for moving the slid-l ing mold into filling, pressing and mold emptying positions i'n the illustrative embodiment herein disclosed are as follows:

Meshing with the gear 4 is a pinion 4 which meshes with a gear 24 keyed on a shaft 25 -on which. is mounted a cam 26. I provide a lever 27 fulcrumed at any suitab e point herein shown as on the shaft 5. This lever is connected, to the sliding mold 17 by a connecting rod 28. At any suitable point of the lever 27 I provide a roller 29 adapted to coperate with the camv 26. A Huid pressure cylinder 29 is provided preferably mounted on a connection from the abutment 12. This Huid pressure cylinder contains a piston 30 which is connected to the sliding mold 17 by any suitable connection hereln shown as the piston rod 31. The cam 26 moves the mold in one direction and the steam in one end of the cylinder 29 moves the moldl in the opposite direction.

The cam 26 is preferably so shaped that it will at all times determine the positions of rest of the mold for filling, pressing and em tyintg.

n or er that the cam 26 in moving the mold may not have to work against the full. pressure of the steam in the cylinder 29' which obtains when the latter is the actuator for moving the mold, I may provide the cylinder 30 with a valve chest 31, a slide valve 32 and an exhaust port 33. The slide valve 32 may be operated as follows: Attached to the piston 31 is a lug 34 to which is connected a rod 35 having tappets 36 and 37. Any suitable connection `as illustrated at 38, adapted to be operated on by these tappets, may connect this rod with the slide valve 32. The operation of specific embodiment of the mold moving mechanism which is herein described is as follows: Starting with the mold in filling position as illustrated, the clockwise revolution of the shaft 25 permits the roller 29 tov follow the contourof the cam 26 into the depression 39. The roller will follow the contour of Vthe cam because of thesteam pressure in the end 40 of the steam cylinder 29. This'will move the mold into pressing position under pressure receiving member 22. After the pressing operation is completed the roller 29 follows the depressing 41 permitting the fluid pressure to move 'the mold into its 'extreme left position for ejection of the cylinder 29. After complete ejection of the end 40 of the cylinder 29 s'o that the higher' pressure may be operative to move the mold on its next movement to pressing position.

The ejectin mechanism before referred to is in the i ustrative embodiment herein disclosed constructed as follows: A steam cylinder 43 mounted on any suitable support is provided with a piston 43a, a piston rod 44 operating a connecting rod 45 .connected to the bell crank 46 mounted on the shaft 47. One end of this bell crank is positioned to be beneath the mold plunger 19 when the latter is in ejecting position. At such time steam is admitted to the end 48 of the cylinder43 actuating the piston and connecting rod and bell crank to move up the plunger 19 to eject the compressed block. Any suitable stop herein shown as the set screws 49 may serve to limit the upward stroke of the compressing plunger 19 so that its upper surface is Hush with the top of the sliding mold.

, The control of pressure to the cylinder 43 may be performed by a slide valve in any suitable steam chest 101 which, as herein illustrated, is actuated and timed by any suitable mechanism such as a cam preferably mounted on the shaft 25 through suitable connections 103.

Any suitable liquid replenishing vmeans herein illustrated as the manually operable pump 50 may serve to force addltional liquid into the chamber 9 to compensate for any liquid which may leak or otherwise es' cape from that chamber.

The operation ofthe embodiment of my invention herein described is as follows: Starting with the press in fillin position after the filling of the mold as ilustrated, the mold is now moved into pressing position by the Huid pressure in the cylinder 29 as before described. The crank 6 now starts the displacing plunger 8 on its inward stroke producing compressing movement of the plunger 19 through the liquid in the chamber 9 and the ram l1. When a predetermined ressure has been reached on the contents oi) the mold, the displacing plunger 8 will remain substantially stationary but the cylinder 13 may still be moved forward by the crank 6 against the ressure contained in that cylinder. This a lows the actuator to complete its inward stroke. After the actuator has advanced on itsr return stroke suficiently to permit the piston 14 and cylinder 13 to resume their normal relative positions, the mold is moved, as before explained, into its extreme left position so that the top of the maratea mold is uncovered. rlFhe block is vthen ejected by raising the plunger- 19 by operation of the cylinder 43. The cam 26 now moves the mold back into filling position, the block being held by the force of the pressure receiving block 22. When the filling position is reached, the steam is exhausted from the cylinder 48 by means of the slide valve 100. This permits the plunger 19 to fall and the mold to be filled With material from the neck 21. To vary the thickness of the block compressed or to keep it of uniform thickness with varying material, means are provided to regulate the drop of the plunger 19. As herein shown, this comprises a screw 5l manually operable and acting on the bell crank 46.

Claim:

A press comprising, in combination, a bed plate carrying bearings, a horizontal shaft rotatably mounted in said bearings and providing a crank, a crank pin for said crank, a connecting rod connected at one end to said crank pin; an elastic fluid pressure cylinder connected to the other end of said connecting rod and rectiljnearly slidable longitudinally of said bed plate, a piston in said cylinder, a piston rod connected to said piston, a displacing plunger connected to said piston rod, a hydraulic cylinder receiving one end of said displacing plunger, a

lrain above said displacing plunger and Vertically reciprocable in said hydraulic cylinder, means for maintaining a. constant amount of liquid in said cylinder and means providing for the constant admission of elastic pressure iuid between said pist/0n and "ghe rear of said elastic pressure iiuid cylinln testimony whereof, ll have signed my name to this specication in the presence of two subscribing Witnesses.

PRESTON UPHAM. V/vitnesses ROBERT H. KAMMLER, il?. linens CHANDLER. 

